Is there a way to align the view to a non-active camera?
One quick workaround which provides approximation is to use Align View to Active command to align viewport camera to currently selected but not active render camera.



Roughly the procedure would look like:
1. Selecting camera you want to align viewport to.
2. Running View Selected command (as one way to center viewport to selection).
3. Running Align View > Align View to Active > Top (in 2.79 layout it was Shift+Numpad 7).